Examples of javax.portlet.filter.ActionFilter.doFilter()

javax.portlet.filter.ActionFilter.doFilter()
The doFilter method of the Filter is called by the portlet container each time a action request/response pair is passed through the chain due to a client request for a portlet method at the end of the chain.
The FilterChain passed in to this method allows the Filter to pass on the action request and response to the next component in the chain.
The doFilter method of a filter will typically be implemented following this or some subset of the following pattern:
- The method examines the request information.
- The method may wrap the request object passed in to its doFilter method with a customized implementation the request wrapper ActionRequestWrapper in order to modify request data.
- The method may wrap the response object passed in to its doFilter method with a customized implementation of the response wrapper ActionResponseWrapper to modify response data.
- The filter may invoke the next component in the filter chain. The next component may be another filter, or if the filter making the invocation is the last filter configured in the deployment descriptor for this chain, the next component is the target method of the portlet. The invocation of the next component is effected by calling the doFilter method on the FilterChain object, and passing in the request and response with which it was called or passing in wrapped versions it may have created. The filter chain�s implementation of the doFilter method, provided by the portlet container, must locate the next component in the filter chain and invoke its doFilter method, passing in the appropriate request and response objects. Alternatively, the filter chain can block the request by not making the call to invoke the next component, leaving the filter responsible for filling out the response object.
- After invocation of the next filter in the chain, the filter may examine the response data.
- Alternatively, the filter may have thrown an exception to indicate an error in processing. If the filter throws an UnavailableException during its doFilter processing, the portlet container must not attempt continued processing down the filter chain. It may choose to retry the whole chain at a later time if the exception is not marked permanent.
- When the last filter in the chain has been invoked, the next component accessed is the target method on the portlet at the end of the chain.
@param request the current action request @param response the current action response @param chain the remaining filter chain @throws IOException if an IO error occurred in the filter processing @throws PortletException if a portlet exception occurred in the filter processing

            filterListIndex++;
            try {
                ActionFilter actionFilter = (ActionFilter) loader.loadClass(filter.getFilterClass()).newInstance();
                FilterConfigImpl filterConfig = new FilterConfigImpl(filter.getFilterName(),filter.getInitParams(),portletContext);
                actionFilter.init(filterConfig);
                actionFilter.doFilter(request, response, this);
                actionFilter.destroy();
            } catch (InstantiationException e) {
                e.printStackTrace();
            } catch (IllegalAccessException e) {
                e.printStackTrace();

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            try {
                ActionFilter actionFilter = (ActionFilter) loader.loadClass(filter.getFilterClass()).newInstance();
                FilterConfigImpl filterConfig = new FilterConfigImpl(filter.getFilterName(), filter.getInitParams(),
                        portletContext);
                actionFilter.init(filterConfig);
                actionFilter.doFilter(request, response, this);
                actionFilter.destroy();
            }
            catch (InstantiationException e) {
                e.printStackTrace();
            }

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      int currentIndex = index++;
      try
      {
         PortletFilter filter = filters.get(currentIndex);
         ActionFilter actionFilter = ActionFilter.class.cast(filter);
         actionFilter.doFilter(req, resp, this);
      }
      finally
      {
         index--;
      }

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        if (filterListIndex < filterList.size())
        {
            PortletFilterInstance filter = filterList.get(filterListIndex);
            filterListIndex++;
            ActionFilter actionFilter = (ActionFilter) filter.getRealPortletFilter();
            actionFilter.doFilter(request, response, this);
        }
        else
        {
            portlet.processAction(request, response);
        }

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      int currentIndex = index++;
      try
      {
         PortletFilter filter = filters.get(currentIndex);
         ActionFilter actionFilter = ActionFilter.class.cast(filter);
         actionFilter.doFilter(req, resp, this);
      }
      finally
      {
         index--;
      }

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